Driving fixture



Dec. 29, v` J, E LOVELY DRIVING FIXTURE Filed April 8, 1930 a sheets-sheetl 1;-

' Dec. 29, 1931. f i E LOVELY 1,838,692

DRIVING FIXTURE Fiied Apri; s, 195o4 2 sheets-sheet 2 l *la "JOHN E. LOVELY, or' SPRINGFIELD, vERMoNT,.AssIeNoR To JoNEs& LAMsoN Nm?V with a pivoted jaw, the pivoted j aw having Patented Dec. 29, 1931 UNITED srATEsi PATENT `ori-#Ice CHINE COMPANY, OF SPRINGFIELD, 'VEIR11I1'.O1\1'I,A CORPORATION 0F VERMONT DRIVING `FIXTURE Application fried Aprii a, 1930.v serial No. Massa.

This invention relates to devices for grasplng work to rotate 1t with a rotary work spindle and has for an object to produce such l a device which will drive the work without 5 subjecting it to unequal driving pressure' and yet which will release the work readily when desired and which is simple and inexpensive tomake.V To these ends it comprises a ring having a fixed Jaw and cooperating therean eccentric work-engaging face, the ring being `mounted for oating movement in any direction transverse to the work axis so as to" equalize the driving pressure of the jaws on the work.

For a more complete understanding of this i invention, referencemay be had to the accompanying drawings in which A Figure 1 is a front elevation of the device.

Figures 2and 3 are sections on lines 2-2' and 3-3, respectively, fof Figure 1.

Figure 4 is a section onlline 4-4 of Figure 3. f

Figure 5is a detail section to a smaller scale on line 5-5 of Figure 4.

Figure6 is a disassembled perspective 'of certain parts of a spring centeringmechanism.

Figure 7 is a detail section kto a larger scale on line 7-7 ofl Figure 1.

Figures 8 to 11 inclusive are perspectives, Figure 10 showing parts brokenaway, of certain of the elements. l

Figure 12 is a detail section on line 12-12 of Figure 1. i

Referring to Figures 2 and 11, at 1 is shown a work spindle carryinga live center 2. This work spindle is shown as provided with a nose portion 3 having a central circular projection 4 provided with a conical periphery as 5. In engagement with this nose portion and having a'. recess fitting against this conical periphery is a base ring member 6 which may be secured tothe spindle nose as by means of the bolts 7. As shown in Figure 12, the member 3 may be provided with a key piece 8 seated in a slot 9 therein, as shown best in Figure 11, and in a notch 10 in the rear face: of the base ring member 6, as shown in`V Figure 10, whereby ble a pair of guide lugs 13 on anintermediate ring ,member 14 shown detached in Figure 9.

This ring 14 has onits forward face a guideway or groove 15 arranged at right angles: to theguidelugs-l to receive `guideflugs 16` on a` Jaw-carrying ring17- shown` detached in Figure 8. Thesethree ring members are held assembled together by a pair `of headed posts 20 best shown in Figures 3 and 5, these` posts 'having their inner ends threaded as ati 21 and engaged in threadedholes 22 in the base member 6. These posts 20 pass through enlarged openings 24 in the intermediate member 14, and 25`in the jaw member v17 and the openings 25are provided with kcounter-V bored outer ends as 26vwi'thin which the heads 27 of these V'posts ride. `This construction permits the` intermediate member 14 to slideto a limited extent transversely of the base member 6 inone direction as limitedby itsf guiding engagement with the base member and also permits the jaw-carrying member n 17 to slide to a limited extent across the face of'the intermediate member 14 in a single direction permitted by its engagement with the intermediate member at right angles' tothe-motion of the intermediate members relative to the base. member.V By ajcombina-4 tion of these twomotions it will be evident that the jaw-carrying member 17 is permitted a limited floating `movement in any direc` tion in a plane transverse to the work axis."V

Means are provided `for yieldingly center# ing the j aw-calrrying"` ring 17. To this end, spring means for 'centering -the 'member L17 with reference tothe intermediate memberl 14 comprise spring-pressed plugs 30 riding in openings 31 in the jaw-carrying member 17 and bearing against opposite sides ofthe: posts 20 in the direction of relative mover ment between the member. 17 and the mem-r ber 14. As shown bestin Figure 3, these plugsBO are held pressed against the posts 2O by'meansiof coil springs 35 reactingbe` tween the rear faces of these plugsvand seat"v cup members 36, a plug and a cup member being shown detached in Figure 6. All eX- cept one of these seat members .36 engages directly against a flattened portion 37 of a pin 38 seated in a perforation 39 extending from face to face of the member 17. The

other of these seat members 36, four being shown in connection with the posts 20, is backed up by a plug or block 40 which is seated against'a pin-38 This plug-40 is employedinthis particular instance to permit the perforation 39 to be placed .sufficiently far from the post 20 to avoid conflicting with centering mechanism for a jaw member, to be presently described. Spring means are alsozemployed to vcenter the intermediate memberz'with respect to the base member as follows. The intermediate member'l 145 isA provided'with a pair of enlarged openings withineach ofu which extends the outer end portion of a post4 46. Each of these posts has its? inner end threaded as at. 47 and engages inv a threaded hole 48 in the base member 6; The intermediate membervll, as

shown best in- Figure 4, is provided with pairs of alined openings 50 within which are,

slidably mounted centering plugs 51 which bear'against opposite faces of each of the` posts^46 in-afdirection; parallel to the relative sliding; motion permitted by the engagements of the intermediate and base members. These plugs 51 are similar in construction to the plugs BO'hereinbefore describedand are held .pressed against opposite sidesofithepostsv 46 by springs 572 seated in` socket members53 held by their engagement `in the flattened portions of p'ins; 5.4,` allina similar'mannerto the centeringdevices for'the jawy ring 17 which arey carriedtherein as previouslydescribed. itfwillbe seen that the aw ring is yieldingly held'. centered with respect: to the-axi s. of thef work spindle.-

The, front face offthe memberY 17l is profi vided with af pairof oppositely disposed socket-i depressions 60 and 61;. The depression yis-.formed to receive rigidly therein a workengaging jaw-62 having'its inner end forked to present a` pair of inclined faces 63 for, engagement f with rthe work shown in dot:-

tedilines at 64 and theend ofwhich` is supportedion the Vlive center 2 in the usual mannera` This aw, member 62." is fixed: rigidly inposition as by the'screws. Cooperating vWithithisrigid'forked jawmeniber is a jaw;member which is so vdesigned that its work-engaging` face may yield away from theijawfme-mber 62. VFor this purpose it is shown as ypivoted as-at 71 within the upper portion Lof thefrecess 61alnd isprovided with aaworkeengaging facey 72 shown as serrated forfthe'abetterengagement with the work, thisifacebeingfarranged eccentric to the pivot 71. Thus as the-jawO `is rocked,'its

5 work-ien'gaging face-'is brought` closer to or Thus shown best in Figure 7. As there shown` one comprises a plunger 75 having a closed end engaging an edge face of the ]aw mem- 'ber' 7 0 and enclosing a coil spring 76. This spring reacts against an annular shoulder 77 on a plug' 7 8 having threaded engagement with a threaded opening 79 extending inwardly from theedge portion of the jawcarrying ring 17. This threaded plug 78 is also provided with a stem portion 80 which centers the spi-ing v7 6. The vplug 78 is shown asvfixed in position by a set screw 81. The opposite spring pressed plunger is shown as a solid plug against which bears aspring 86 reacting between the rearl end of this plug and a` threaded plug 87 engaging in a mating'threaded opening 88 in the jaw-carrying member 17, this plug 87 being also -fixed in position by means of a set screw 89. The spring 86 is stronger and stiffer than the spring 76 so that the jaw may yield readily in releasing direction-when the operator desires to remove the work from the machine, this being important for the reason that the work mustbe moved awa-y from the fixed aw 62 in order to disengage it from the fixture. In normal driving condition, however, the rotating pressure of the fixture against the work resisted by the action of the tools tending'toprevent rotation of the workholds the jaws in tightgripping relation to the work.

Any embodiment of this invention having thus been described it should be evident to those skilled in the art that. various changes and modifications might be made therein Without departing from the spirit or scope of this invention asrdefned by the appended claims.

I claim;

1. In combination with a spindle. a base member coaxial with saidspindle, aii intermediate member carried by said base member and slidable transversely thereof in one direction, a. jaw ring carried by said interinediate member and slidable transversely of said axis at rightlangles to the sliding direction of said intermediate member, mea ns for yieldingly centering said slidable ring member coaxially with said spindle, a jaw having a pair of angularly disposed work-engagingI faces fixed to said ring, a pivoted jaw carried by said ring diametrically opposite to said fixed jaw and having an eccentric work-engaging face, and spring means for holding'said pivoted j aw` in engageinent'with Work extending through said ring between said jaws.

2. In combination With a spindle, a base member fixed coaxially to said spindle, an

intermediate member, said base and intermediate members being formed complementally to permit sliding oi" said intermediate member across the face o1c said base member and transversely of said spindle axis in one direction, a jaw-carrying member,said liavv-carrying member and intermediate members being formed eomplementally to permit said jaw member to slide across the face of said intermediate member at right angles to the direction of movement of said intermediate member relative to said base member, springs tending to hold said members in coaxial arrangement, and a fixed Work-engaging javv and a yields-.ble cooperating Work-engaging ja-W carried by said jaw member.

3. In combination with a spindle, a base member fixed coaxially to said spindle, an intermediate member, said base and interme diate members being formed complementally to permit sliding of said intermediate member across the face of said base member and transversely of said spindle axis in one direction, a. jaw-carrying member, said jaw-carrying member and intermediate members being formed complementally to permit said jaw member to slide across the tace of said intermediate member at right angles to the direc tion of movement of said intermediate member relative to said base member, a fixed Workengaging Vjavv and a yieldable cooperating Work-engaging jaw carried by said jaw member, postscarried by one of said base and intermediate members and extending through enlarged openings in the other of said two members, spring means in said other member bearing on said posts to hold said intermediate member yieldingly centered With reference to said base member, posts extending through enlarged openings in one of said intermediate and jaw-carrying members, and spring means carried by one of said intermediate and jaw-carrying members to yieldingly center said jaw-carrying member With reference to said intermediate member.

4. In combination with a spindle, a base member iixed coaxially to said spindle, an intermediate member, said base and intermediate members being formed complementally to permit sliding of said intermediate member across the tace of said base member and transversely of said spindle axis in one direction, a jaw-carrying member, said jawcarrying member and intermediate members being formed complementally to permit said iaW member to slide across the face of said intermediate member at right angles to the direction of movement of said intermediate member relative to said base member, a iixed Work-engaging jaw and a yieldable cooperating Work-engaging jaW carried by said jaw member, spring means tending to center said intermediate memberrelative to said base member, and'spring means tending to center said jaw-carrying member relative to said intermediate member.

5. In combination with a spindle, a base member fixed coaxially to said spindle, Aan intermediate member, said base and intermediate members vbeing formed complementally to permit sliding of said intermediate member across the face of said base member and transversely of said spindle axis in one direction, a jaw-carrying member, said j aw carrying member Vand intermediate members being formed complementally to ermit said javv` member to slide across the tace of said intermediate member at right angles to the direction of movement of said intermediate member relative to said base member, a fixed Work-engaging avv and a yieldable cooperan ing Work-engaging jaw carried by said jaw member, posts extending through enlarged openings in said jaw-carrying and intermediate members and secured in said base member, posts extending through enlarged openings Lin said` intermediate member and secured in said base member, spring means carried by said intermediate member and bearing on said last-mentioned posts and centering said intermediate member relative to said base member, and springmeans in said jawcarrying member and bearing on said irstmentioned posts for centering said jawcarrying member relative to said intermediate member. y

6. n combination with a spindle, of a base member fixed coaxially to saidspindle, Van

intermediate member, said base and intel.-

Vmediate members being formed complementally to permit sliding of said intermediate member across the face of said base member and transversely of said spindle axis in one direction, a jaw-carrying member, said jawcarrying member and intermediate members being formed complementally to permit said jaw member to slide across the face of Said intermediate member at right angles to the direction of movement of said intermediate member relative to said base member, a fixed Work-engaging jaw and a yieldable cooperating Work-engaging jaw carried by said jaw member, headed posts extending through enlarged openings in said jaw-carrying and intermediate members and secured in said base member, posts extending through enlarged openings in said intermediate member and secured in said base member, spring means carried by said intermediate member and bea-ring on said last-mentioned posts and centering said intermediate member relative to said base member, and spring means in said jaw-carrying member and bearing on said headed posts for centering said jaw-carrying member relative to said intermediate member, the heads of said headed posts engaging the front face of said jaw-carrying member and holding said members assembled.

7. A device of the class described comprising a member having means for securing it to the end portion of a spindle, and means carried by said member for gripping Work arranged in axial alinement with said spindle, said gripping means comprising a jaw having a forked Work-engaging face, a jaw pivoted to said member opposite to said forked face and having a Work-engaging face eccentric to its pivot, said forked face jaw being rigidly secured to said member, said member securing means including connections permitting floating of said member transversely of the axis of said spindle in any direction and yielding centering mechamsm.

8. In combination7 a ring member, means tor supporting said member from a rotary Wort spindle for yielding floating in any direction transverse to the axis of said spindle` a ixed forked Work-engaging jaw Carried by said member, a j aw cooperating with said iixed aw to engage the Work and pivoted to said member, said pivoted jaw having a Work-engaging face eccentric to its pivot, and opposed spring means engaging opposite edges of said pivoted jaw for holding said pivoted jaw in position for rotation of said spindle in driving direction to cause said jaws to grip the work, said spring means tending to release said pivoted Jaw having a stiffer spring than its opposed means to facilitate release of the Work when said spindle is stationary.

ln testimony whereof l have aiiXed my signature.

JOHN E. LOVELY. 

